Install additional packages needed by ezmlm-idx (if you are planning to use it with mysql/pgsql):

# apt-get install libmysqlclient-dev libpq-dev

There is a Debian specific bug (probably that is why ezmlm-idx is not
in the official release) inside this package and it is path to qmail-queue
program. The path to qmail-queue is hardcoded in file conf-qmail:
"/var/lib/qmail" and ezmlm-manage tries to launch it from there.
Solutions are either to edit conf-qmail file and change path to
/usr/sbin or to make a link:

This will make mailing list "testlist" on domain lists.example.com. You can subscribe by sending mail at address testlist-subscribe@lists.example.com. For more information you can see man pages of ezmlm and by sending mail to testlist-help@lists.example.com.